S12 lock nut for Giant bikes derailleur hanger D398 M12x1.5 thread
Made by Pilo.
Note: D398 derailleur hanger for Giant:
S11 - M12x1 threading
S12 - M12x1.5 threading
S13 - M12x1.75 threading
For any questions please e-mail us:
To be sure if this the right part, please send us photos of:
1. Your derailleur hanger from both sides;
2. And if possible bike‘s frame part photos, where dropout was attached.